package com.sean.community.comtroller.advice;

import com.sean.community.util.CommunityUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * 统一异常处理
 */
@ControllerAdvice(annotations = Controller.class)
public class ExceptionAdvice {

    private static final Logger logger = LoggerFactory.getLogger(ExceptionAdvice.class);

    @ExceptionHandler(Exception.class)
    public void handleException(Exception e, HttpServletRequest request, HttpServletResponse response) throws IOException {
        logger.error("服务器发生异常： " + e.getMessage());
        for (StackTraceElement element : e.getStackTrace()) {
            logger.error(element.toString());
        }
        // 判断是异步请求还是普通请求
        String xRequestedWith = request.getHeader("x-requested-with");
        if ("XMLHttpRequest".equals(xRequestedWith)) { // 异步请求
            response.setContentType("application/plain;charset=utf-8"); // 返回普通字符串(JSON格式)
            PrintWriter writer = response.getWriter();
            writer.write(CommunityUtil.getJSONString(500, "服务器异常！"));
        } else {
            response.sendRedirect(request.getContextPath() + "/error500");
        }
    }
}
